US4889834AExpiredUtilityPatentIndex 73

SiC-Al2 O3 composite sintered bodies and method of producing the same

Assignee: NGK INSULATORS LTDPriority: Sep 30, 1987Filed: Sep 20, 1988Granted: Dec 26, 1989

Est. expirySep 30, 2007(expired)· nominal 20-yr term from priority

Inventors:NIIHARA KOICHI NAKAHIRA ATSUSHI

C04B 35/111C04B 35/80C04B 35/103

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Abstract

SiC-Al 2 O 3 composite sintered bodies having high strength and toughness are constructed by dispersing SiC particles essentially inside individual of Al 2 O 3 grains constituting a material.

Claims

exact text as granted — not AI-modified

What is claimed is: 
     
       1. An SiC-Al 2  O 3  composite sintered body, consisting essentially of: a matrix of Al 2  O 3  grains, said grains having a grain size of not greater than 5 μm; and   2-10 mol % SiC grains dispersed essentially inside individual Al 2  O 3  grains, said SiC grains having a grain size of not greater than 0.5μm;   wherein said composite sintered body has a K IC  of not less than 5.0 MPam 0 .5.

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